【是數(shù)字但不是有效數(shù)字問(wèn)題】 var quantity:Number = 15 - "rabbits"; trace(typeof quantity); //顯示: "number" , 但它是NaN (not a number) trace(quantity is Number); //true trace(quantity != NaN); //false //使用isNaN()函數(shù)檢測(cè): isNaN(quantity); //true //檢測(cè)變量是否內(nèi)含有效數(shù)字: !isNaN(quantity); //false
【取消默認(rèn)的嚴(yán)格編譯模式】 在"Navigator"窗框里右鍵你的項(xiàng)目>選中"Properties">選中"ActionScript Compiler">取消"Enabel compile-time type checking"選項(xiàng)
【基元數(shù)據(jù)類型和復(fù)雜數(shù)據(jù)類型好比"值類型"和"引用類型"】 基元數(shù)據(jù)類型類似按值傳遞: var intOne:int = 1; var intTwo:int = 1; trace(intOne == intTwo); //true
【復(fù)雜數(shù)據(jù)類型類似按引用傳遞】 var arrayOne:Array = new Array("a", "b"); var arrayTwo:Array = arrayOne; trace(arrayOne == arrayTwo); //true //----------------------------------- var arrayOne:Array = new Array("a", "b"); var arrayTwo:Array = new Array("a", "b"); trace(arrayOne == arrayTwo); //false
【隱式的取出方法(getter)和設(shè)定方法(setter)】 public function get count():uint { return _count; } public function set count(value:uint):uint { if(value < 100){ _count = value; }else { throw Error(); } }
【確保類是絕不會(huì)有子類,使用final】 final public class Example{}
【檢測(cè)播放器類型】 flash.system.Capabilities.playerType 可能的值有: "StandAlone"，用于獨(dú)立的 Flash Player "External"，用于外部的 Flash Player 或處于測(cè)試模式下 "PlugIn"，用于 Flash Player 瀏覽器插件 "ActiveX"，用于 Microsoft Internet Explorer 使用的 Flash Player ActiveX 控件
【刪除數(shù)組中第一個(gè)元素并返回該元素,使用shift()方法】 var letters:Array = new Array("a", "b", "c"); var firstLetter:String = letters.shift(); trace(letters); //輸出: b,c trace(firstLetter); //輸出: a
【刪除數(shù)組中最后一個(gè)元素并返回該元素的值,使用pop()方法】 var letters:Array = new Array("a", "b", "c"); trace(letters); //輸出: a,b,c var letter:String = letters.pop(); trace(letters); //輸出: a,b trace(letter); //輸出: c
【查找數(shù)組中第一個(gè)相匹配的元素】 var array:Array = ["a", "b", "c", "d", "a", "b", "c", "d"]; var match:String = "b"; for(var i:int = 0; i < array.length; i++) { if(array[i] == match) { trace("Element with index " + i + " found to match " + match); //輸出: Element with index 1 found to match b break; } }
【查找數(shù)組中最后一個(gè)相匹配的元素】 var array:Array = ["a", "b", "c", "d", "a", "b", "c", "d"]; var match:String = "b"; for(var i:int = array.length - 1; i >= 0; i--) { if(array[i] == match) { trace("Element with index " + i + " found to match " + match); //輸出: Element with index 5 found to match b break; } }
【把字符串轉(zhuǎn)成數(shù)組】 使用String.split()方法: var list:String = "I am YoungBoy."; var words:Array = list.split(" "); //以空格作為分隔符將字符串切割 trace(words); //輸出: I,am,YoungBoy.
【把數(shù)組轉(zhuǎn)成字符串】 使用String.join()方法: var myArr:Array = new Array("one", "two", "three"); var myStr:String = myArr.join(" and "); trace(myArr); //輸出: one,two,three trace(myStr); //輸出: one and two and three
【使用對(duì)象數(shù)組處理相關(guān)數(shù)據(jù)】 var cars:Array = new Array(); cars.push({make:"Mike", year:1997, color:"blue"}); cars.push({make:"Kelly", year:1986, color:"red"}); for(var i:int = 0; i < cars.length; i++) { trace(cars[i].make + " - " + cars[i].year + " - " + cars[i].color); } //輸出: // Mike - 1997 - blue // Kelly - 1986 - red
